PER CURIAM.
After careful consideration we conclude that this appeal presents no colorable issue for decision and, therefore, we summarily affirm the district court's judgment. We briefly explain this conclusion.
The defendant's principal claim of error concerns the district court's purported use of an obstruction-of-justice enhancement, based on the defendant's alleged perjurious testimony at a preliminary hearing, in calculating the guideline sentencing range (GSR).
The short of it is that the district court, in fashioning the sentence imposed, never employed the alternate GSR that it originally calculated. It employed instead the GSR ordained by the ACCA. That GSR was entirely independent of the obstruction-of-justice finding. Any error in the calculation of the obstruction-of-justice enhancement was, therefore, harmless.
It is perhaps possible to construe the defendant's brief as raising a different argument based on the obstruction-of-justice enhancement. He may be arguing that the 24 months for perjury added to his 180-month ACCA sentence should be vacated because the statements in question were not material and because it is more plausible that he had a hazy memory (rather than an intention to lie). Even if we were to consider this line of reasoning, it would be unavailing. There was no error in the perjury finding and the added period of incarceration was warranted under 18 U.S.C. § 3553(a).
The defendant's other claims of error are even more easily dispatched. To begin, he argues that the prior convictions that were employed as predicates in order to support the imposition of a sentence under the ACCA should have been listed in the indictment and proved to the jury beyond a reasonable doubt rather than simply found by the judge at sentencing. This argument is foreclosed by Supreme Court and circuit precedent.
The defendant's remaining argument is that the portion of the ACCA that was used to ensnare some of his prior convictions — the so-called "otherwise" clause, 18 U.S.C. § 924(e)(2)(B)(ii) — is unconstitutionally vague. This argument, too, is foreclosed by settled precedent.
We need go no further. For the reasons elucidated above, the judgment of the district court is summarily affirmed. 1st Cir. R. 27.0(c).